# Chapter 1: Introduction

- [x] [1.1](./ex.1.1.md)
- [x] [1.2](./ex.1.2.md)
- [ ] 1.3
- [x] [1.4 ▷](./ex.1.4.md)
- [x] [1.5 ▷](./ex.1.5.md)
- [x] [1.6 ▷](./ex.1.6.md)
- [x] [1.7 ▷](./ex.1.7.md)
- [x] [1.8 ▷](./ex.1.8.md)
- [x] [1.9](./ex.1.9.md)
- [x] [1.10](./ex.1.10.md)
- [x] [1.11](./ex.1.11.md)
- [ ] 1.12
- [ ] 1.13 ▷
- [ ] 1.14 ○
- [ ] 1.15 ●
- [x] [1.16](./ex.1.16.cpp)
- [x] [1.17 ▷](./ex.1.7.md)
- [ ] 1.18 ●●
- [ ] 1.19 ○
- [ ] 1.20 ●
- [ ] 1.21 ●●
- [x] [1.22 ●](./ex.1.22.md)
- [x] [1.23 ●](./ex.1.23.md)
- [ ] 1.24 ●●
- [x] [1.25](./ex.1.25.md)
- [x] [1.26](./ex.1.26.md)
